BC337 IR Led Arduino

227

04:00:17

published 8 years ago

Fireblade

8 years ago

Hello, why have you used transistor please?

BillyT

8 years ago

A transistor would be used to limit the current draw from the output pin thus protecting the device. A 10k biasing resistor would probably be a better choice.

moonshine

8 years ago

I used a BC337 and it works well with an 1ko. The current difference between 1k and 10k would be only 2mA (with a 47o on the LED)

moonshine

8 years ago

Part of a small project https://github.com/MoonshineSG/remote.ir

hurz

8 years ago

Quite a weak transmitter. Standard IR diode driver do that a little different and overdrive the diode current, but only in microseconds. Cuz, current is light intensity and as long the chip temperatur is low enough you can almost pump 100 times more current then nominal specified! Only this way you will have an acceptable range of control.

moonshine

8 years ago

I don’t need range. It’s only used to “teach” codes to universal remote from 2-4 inches.

moonshine

8 years ago

But it’s always good to know about how IR LED works.

hurz

8 years ago

So headline suppose to be "ultra low range IR transmitter"?

moonshine

8 years ago

to be honest, this was made for my own use and didn't think anyone will pay attention to it :D

moonshine

8 years ago

just for fun, i tested it and even from about 3m it still works. so not so "ultra low" :D

hurz

8 years ago

Wait for sunny weather!

moonshine

8 years ago

I live in Singapore. That’s all we have :)

hurz

8 years ago

Sun includes plenty of IR spectrum.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.